Recordable optical disk and method of manufacturing the same

Abstract

Information is optically recorded to a recordable optical disk by a light beam, and a return light is received from the recordable optical disk to produce a tracking error signal. The recordable optical disk includes: a substrate having a disk shape; a groove formed on a surface of the substrate along a predetermined track which the light beam is made to follow; and a recording layer formed on the surface of the substrate, to which the information is recorded by the light beam. A depth of the groove is prescribed such that an amount of the return light from the groove becomes smaller than an amount of the return light from the portion of the recording layer other than the groove in a condition after recording.

What is claimed is: 
     
       1. A recordable optical disk, to which information is optically recorded by a light beam and from which a return light is received to produce a tracking error signal, said recordable optical disk comprising: a substrate having a disk shape;   a groove formed on a surface of said substrate along a predetermined track which the light beam is made to follow; and   a recording layer formed on the surface of said substrate, to which the information is recorded by the light beam,   wherein a depth of said groove is prescribed such that an amount of the return light from said groove becomes smaller than an amount of the return light from the portion of said recording layer other than said groove in a condition after recording.   
     
     
       2. A recordable optical disk according to claim 1, wherein said recording layer comprises phthalocyanine dye. 
     
     
       3. A recordable optical disk according to claim 1, wherein the portion of said recording layer other than said groove comprises a land portion. 
     
     
       4. A recordable optical disk according to claim 1, wherein the depth of said groove is prescribed such that an average value of a RF signal at said groove is smaller than a value of a RF signal at the portion of said recording layer other than said groove. 
     
     
       5. A recordable optical disk according to claim 1, wherein the information is recorded in said groove as a pit array. 
     
     
       6. A recordable optical disk according to claim 1, wherein said recordable optical disk comprises a recordable LD (Laser Disk). 
     
     
       7. A method of manufacturing a recordable optical disk, to which information is optically recorded by a light beam and from which a return light is received to produce a tracking error signal, said method comprising the steps of: preparing a substrate having a disk shape;   forming a groove on a surface of said substrate along a predetermined track which the light beam is made to follow; and   forming a recording layer on the surface of said substrate, to which the information is recorded by the light beam,   wherein a depth of said groove is prescribed such that an amount of the return light from said groove becomes smaller than an amount of the return light from the portion of said recording layer other than said groove in a condition after recording.   
     
     
       8. A method according to claim 7, wherein, in the recording layer forming step, said recording layer is formed of phthalocyanine dye. 
     
     
       9. A method according to claim 7, wherein, in the groove forming step, the depth of said groove is prescribed such that an average value of a RF signal at said groove is smaller than a value of a RF signal at the portion of said recording layer other than said groove. 
     
     
       10. A method according to claim 7, further comprising the step of recording the information to said recording layer in said groove as a pit array.